Thermo Scientific F30400, Installation And Operation Manual

Page: 47 / 70

Thermo Scientific Large Tabletop Muffle
45
10
Installation and Operation of Air Control
Models F30420-33-60-80, F30420C-60-80, F30428C-60-80, F30430CM-33-60,
F30430CM- 60, F30438CM-60
Installation
Compressed Air Hook-Up
1. A 0.250 inch tube fitting is located at the rear of the furnace.
2. Using 0.250 inch I.D. rubber tubing, connect a piece of tubing from this input fitting to a
corresponding 0.250 inch fitting located on the regulated side of a pressurized air service line.
3. Prior to making connections at the regulator, ensure that the regulator is completely closed (0 psi).
4. Turn flow control valve located at the bottom of the flow meter (front control panel) clockwise to
closed positions.
5. Turn regulator to maximum output pressure of 20 psi. Check for any leaks at connection points of
connecting tubing.
6. Open flow control valve slowly until ball in flow meter reads between 40-45 liters per minute flow
rate.
7. Open furnace door and check that air is exhausting from the manifold located at the bottom rear
of the chamber.
8. Turn flow control to off (clockwise).
Exhaust Tubing Hook-Up
Using accessory stainless steel tubing (part number AY408X1A for furnace temperatures less than
975°C, part number AY718X1 for furnace temperatures of 975°C or greater) or equal quality 2.5 inch
I.D. stainless steel tubing, connect flexible tubing from vent port at top of furnace case to an
appropriate negative pressure exhaust system. This exhaust system must be capable of handling smoke
and gases produced in an ashing procedure.
.
Coal ashing furnaces -60 models contain a feature to provide air (or inert gas) flow
within the furnace chamber.